288 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



upper leaves, being less common than var. wrightiana (A. Gray) 

 Kearney and Peebles (M. wrightiana A. Gray), which has puberulent, 

 scarcely viscid stems and all the leaves usually distinctly petioled. 



5. OXYBAPHUS 



Plants perennial, herbaceous; stems tall and erect, or low and de- 

 cumbent; leaves opposite, usually thickish; involucre calyxlike, gamo- 

 phyllous, becoming enlarged and papery in fruit; flowers 1 to 5 in each 

 involucre; perianth campanulate or short-funnelform, slightly oblique; 

 fruits more or less obovoid, 5-angled. 



Key to the species 



1. Leaf blades not more than 4 times as long as wide, short-cuneate, truncate, 



or cordate at base; petioles mostly elongate, well differentiated from the 



blade; stems pilose or villous above, or throughout, with soft, weak hairs, 



often also glandular; fruit short-pilose (2). 



2. Stems low, decumbent or nearly prostrate, much-branched, viscid, and pilose 



or villous, to the base; leaf blades deltoid-ovate to nearly orbicular, not 



or scarcely longer than wide; perianth pale pink or purplish, pubescent. 



1. O. PUMILUS. 



2. Stems normally tall and erect, commonly not branched below the inflores- 



cence, glabrous below or puberulent in lines (seldom on the whole surface) ; 

 leaf blades elongate-deltoid (sometimes deltoid-ovate or ovate-lanceo- 

 late), commonly 1.5 to 4 times as long as wide; perianth purplish red, 



rarely pale pink, often nearly glabrous 2. O. comatus. 



1. Leaf blades 5 or more times as long as wide, narrowly linear to broadly lanceo- 

 late, acutish to long-attenuate at base; petioles short or almost none; 

 stems normally tall, erect, and not branched below the inflorescence (3) . 



3. Perianth bright red, funnelform, 3 to 4 times as long as the copiously strigose 



or short-pilose involucre; stems glaucous, glabrous or inconspicuously 



strigose, only the peduncles bearing spreading hairs_ _ 3. O. coccineus. 



3. Perianth pink or purple, usually pale-colored, campanulate, about twic'e as 



long as the involucre (4). 



4. Stems, involucre, perianth, and fruit glabrous or sparsely strigose; leaf 



blades more than 10 times as long as wide, attenuate at both ends, 



thick 4. O. GLABER. 



4. Stems usually glandular, and pilose or villous, above; involucre pilose or 

 villous, often glandular ; perianth more or less pubescent ; fruit copiously 

 strigose or pilose 5. O. linearis. 



1. Oxybaphus pumilus Standi., Field Museum Nat. Hist. Bot. Ser. 8: 



11. 1930. 



Allionia pumila Standi., Contrib. U. S. Natl. Herbarium 12: 

 345. 1909. 



Coconino, Mohave, Gila, and Yavapai Counties, 3,000 to 7,500 feet, 

 July to September, type from Kingman, Mohave County (Lemmon in 

 1884). New Mexico, Arizona, Nevada, and southeastern California. 



A collection in the Santa Catalina Mountains, Pima County, south 

 of the main area of 0. pumilus in Arizona (Tourney 484) is referred 

 doubtfully to this species. It has an exceptionally deeply cleft 

 involucre, with narrowly triangular teeth. 



2. Oxybaphus comatus (Small) Weatherby, Amer. Acad. Arts and 



Sci. Proc. 49: 492. 1913. 



Allionia comata Small, Fl. Southeast. U. S. 407. 1903. 



Coconino County to Cochise, Santa Cruz, and Pima Counties, 3,500 

 to 9,000 feet, August to October. Western Texas to Arizona, and far 

 south in Mexico. 



